Conveners
Parallel B: WG1
- There are no conveners in this block
Parallel B: WG1
- There are no conveners in this block
Parallel B: WG2
- Yuji ENARI (KEK IPNS)
- Ken SAKASHITA
Parallel B: WG4
- Masaki Kando (QST)
Parallel B: WG4
- Hyung Taek Kim (Advanced Photonics Research Institute, Gwangju Institute of Science and Technology)
Parallel B: WG4
- Konstantin Lotov (NSU & Budker INP)
The KEK ATF (Accelerator Test Facility) serves as a dedicated testbed for developing beam instrumentation technologies in support of the International Linear Collider (ILC) project. As such, it incorporates a variety of diagnostic tools based on laser systems and photodetection technologies. At the ATF, nanometer-scale beam (nanobeam) technology development is underway using the Final Focus...
This report provides an overview of the key stages and technical challenges involved in bringing the injection system into operation, including the electron gun, linear accelerator, and booster synchrotron. The injection complex is critical for achieving the high brightness and stability required by fourth-generation light sources, ensuring efficient top-up injection and minimal beam disturbance.
The design of the DLS is based on pre-bunched FEL where a train of electron micro-bunches with a maximum energy of 8 MeV are being injected into a compact Undulator to produce the THz radiation in the range of 0.18 - 3.0 THz. The frequency tuning in this range is planned to be achieved by varying the separation of the laser micro-pulses which strike the photocathode to produce the electron...
Terahertz radiation is a non-ionising source of radiation falling within the frequency band of 0.1 -10 THz, with applications in medicine, imaging, security, and wireless communications [1]. Unfortunately, the optical and electronic devices conventionally used to generate other radiation bands struggle to output terahertz frequencies. Increasing interest in the beam breakup instability, which...
If a laser- or particle beam-driven plasma wakefield accelerator operates in the linear or moderately nonlinear regime, injecting an externally produced particle bunch (witness) to be accelerated may encounter an alignment problem. Witness alignment tolerances can be relaxed by using a damper, an additional particle bunch produced by the same injector and propagating at a submillimeter...
A beam of relativistic charged particles, when entering the plasma, experiences beam-plasma instability. If the beam is long enough, longer than the plasma wavelength, it divides into a train of microbunches, namely, it self-modulates. This process is highly nonlinear, but under certain conditions becomes reproducible. The way the beam self-modulates depends on the parameters of the system,...
Laser-plasma accelerators enable compact, high-gradient charged particle acceleration with broad potential applications. Despite significant progress in improving beam quality and control, the stability of accelerated electron beams remains significantly lower than that of the driving laser pulses. In this work, we investigate a previously underappreciated source of transverse beam instability...
Laser Wakefield Acceleration (LWFA) has emerged as a groundbreaking technique capable of achieving ultrahigh acceleration gradients exceeding 100 GV/m, enabling the development of compact, tabletop particle accelerators. The practical application of LWFA critically depends on the generation of high-quality and stable electron beams. In this presentation, we report the latest progress from the...
A segmented capillary gas-cell was developed to control the injection and acceleration for laser wakefield acceleration (LWFA).The design consists of multiple capillary blocks with engineered apertures fed by independent gas lines, creating controlled longitudinal density gradients. The central block features a reduced orifice diameter, establishing a down-gradient pressure profile that forms...
Focusing few-TW or even sub-TW laser pulses into a sub-mm-long, dense gas cell opens up opportunities for realizing laser wakefield acceleration of electrons with 100-nA-level currents driven by modern high-repetition-rate lasers. Although the use of pure nitrogen in the cell facilitates the routine generation of 10-MeV-scale electron beams, the strong ionization of nitrogen ions toward higher...
We propose a novel method for changing the length of laser wakefield electron acceleration in a gas jet using a cylindrical blast-wave created by a perpendicularly focused nanosecond laser pulse. The shock front modifies the wake significantly and stops interaction between the laser pulse and accelerated electron bunch, allowing one to directly control the interaction length and avoid...
This study investigates a novel approach to enhancing betatron gamma-ray radiation based on laser wakefield acceleration (LWFA) [1, 2], a compact scheme for generating ultrashort, high-energy photon sources. We report the first experimental realization of a hybrid betatron scheme [3] in which electron acceleration and radiation emission stages are spatially decoupled using a two-stage gas...
